Machine for drying paper



{No Model.)

A. A. SIMONDS.

MACHINE FOR DRYING PAPER.

No. 366,892. Patented July 19, 1887.

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NITED STATES PATENT Fries.

MACHINE FOR DRYING PAPER.

SPECIFICATION forming part 01' Letters Patent No.- 366,892, dated July19, 1

Application filed May 13, 1886. Serial No. 102,119. (No model.)

To all whom it may concern.-

Be it known that I, ALYAN A. SIMONDS, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented a certain new and useful Improvementin Machines for DryingPaper; and I do hereby declare that the following is a full, clear, andexact description of the invention which will enable others skilled inthe art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, and to the letters of reference markedthereon, which form a part of this specification.

My invention relates to machines for drying paper with hot air; and itconsists of a certain construction of parts, fully described in thisspecification, and more particularly pointed out in the claims.

In the manufacture of paper, as soon as the web of the paper has beenformed and con1- pressed into a sheet of the required thickness itpasses to a drier. The driers in ordinary use are those which employsteam heated rollers with endless belt carriers of felt. The pa per asit leaves this drier is slightly calendered, which leaves it in thecondition of the paper of an ordinary newspaper. If the pa per is to bemade into writingpaper, after leaving the drier the web is passedthrough a szing'tub, is again rolled to remove a surplus of size, and isthen divided into sheets and taken to a drying-loft, where it is exposedto a moderately-high tempcratu re for from thirtysix to fortycighthours. This is rendered ncc essary because it has been found that therollerdriers employed in the first drying of the web when used to drysized paper destroy the sizing, and a fine quality of writingpapercannot therefore be made by using such driers.

My object is to produce a drier which will dry sized paper withoutinjuring the sizing, and which can also be used in the first drying ofthe web.

I am aware that paper-driers have been made consisting of largestructures with rollers and belts for carrying the paper web through thesame in a tortuous course, the structure being provided with a hot-airsupply.

I am also aware that a patent has been granted to Clark, December7,18S5,No. 170, 712, in which it is proposed. to pass the paper webthrough boxes of considerable depth each of such boxes being providedwith air-forcing devices or fans at the top and bottom near one end forsupplying a blast of air to the paper on both sides; and I am aware thatinthis patent it is stated thata hot blast is used. My invention differsfrom these constructions in that I provide a tube or box of suchdimensions that but little space is given on each side of the paper web,and such tube or box is provided with an air-inlct at one end on one orboth sides of the paper, and I connect such inlet or inlets by a pipewith an air-heating and air-forcing device, whereby heated air isdelivered against the paper without being cooled or moistened by contactwith the air of the room in which the operation takes place.

By employing this construction I have found that I can dry a paper webmuch more rapidly and cheaply, and can dry sized paper without injuringthe size,and can thus cheapen the cost of the paper to which it isapplied.

The mechanism is illustrated in the accompanying drawings, in whichFigure l is a side View of the blower, fur- I naee, and drying-machine,with certain parts broken away to show the interior construction. Fig. 2is a section of this drying-machine in the line a", exhibiting the partsimmcdiatelybeneath. Fig. 3 is a side elevation of Fig. 2, partly insection.

The same letters of reference indicate identical parts in each of thefigures.

My improved drier consists of a frame, E, in which are mounted rollers JJ J and reel K. Supported on said frame between said rollers are one ormore flat tubes or boxes, F F. These tubes or boxes are connected at oneend by a pipe with air-heating and airforcing devices, which arerepresented in this instance by the blowcr A and furnace I These tubesor boxes at the end opposite the air-la let are open substantially thefull extent of each tube or box, and the other end is provided with anopening for the admission of the sheetof paper to be acted upon. Thisopening con sists of a narrow slot in the center of the end wall, and isof sufficient width to admit of the paper web being passed easily andfreely therethrough. This paper (designated 'i n the draw ings by theletter II) is curved over one of the rollers, J, through the tube or boxF, and

when more than one such box is employed, then around a roller or rollersthrough tube or box F, and is guided thence to reel K. "The paper issubjected to a strong current of hot air in the tubes or boxes F or 1*",and is thereby thoroughly dried.

The heated air may be admitted to the tubes or boxes at both top andbottom, and directed against and made to act upon both sides of thepaper.

I have shown an endless felt band or apron, G, upon rollers J J in thisinstance, and the moist paper received and supported thereu pon whenfirst introduced into the machine. Vhen the tubes or boxes are of greatlength, supportingrollers may be employed to keep the paper fromdragging on the bottom of the box; but this is necessary only when theheated air is admitted solely to the upper side of the paper. When theair is admitted beneath the paper, the current of air will of itselfkeep the paper from dragging on the bottom of the tube or box.

It is well known that the more highly-heated 5 air becomes the greateris its capacity for ab-. rsorbing moisture. The air in this case iscouducted from the heating device and discharged upon the paper in itsmost absorptive condition, and having only a narrow space on 0 each sideof the paper the passage of the air is rapid, a great amount of air isbroughtinto contact with the paper in a given time and the moisture inthe paper rapidly evaporated.

If the heat were applied to the air of the 5 room, the air would haveits temperature very much reduced and lose much of its absorptive pm erbefore it could be forced onto the paper. Were heated air forced intothe room,- the result would be the same. By the use of my de- .0 vice Idirect the air when it is the most highly heated and capable ofabsorbing the greatest amount of moisture against the'wet paper, andthus secure the rapid absorption of the moisture.

.5 While my invention is of especial value in I the manufacture ofwriting-paper, I propose to employ it in drying all other kinds ofpaper. I believe that it will be found to have special advantages indrying wall-papers, paper curtains, and the like paper articles.

Vhat I claim, and desire to secure by Letters Patent, is- I 1. Thecombination, with guiding and supporting rollers for a paper web and anarrow tube or box having an opening the full size of 55 the same at oneend, an opening for the passage of the paper web at the other, and anairinlet near one end of said tube or box, of an air-heater connectedwith the said air-inlet, and an air-blast device for causing a currentof air to pass through the air-heater and tube or box, substantially asdescribed.

2. The combination, with a narrow tube or box having an opening at oneend the full size of the-same, an opening for the passage of a paper webat the other end, and air-inlets at the top and bottom of'the said tubeor box near one end of the same, of an air-heater connected with saidinlets, an air-forcing device for causing acurrent of air to passthrough the heater and tube, and guiding and supporting rollers forguiding and supporting a web of paper through the center of the tube orbox, substantially as described.

3. The combination, with a narrow tube or box having an opening at oneend the full size of the same and a narrow slot for the passage of apaper web at the other end, of

hot-blast inlets at the top and bottom, guiding and supporting rollersfor the paper, adjusted 8: to carry the paper centrally through the tubeor box, an air-heater connected to the hot-air inlets, and a forcingdevice for causing a current of air to pass through the air-heater andinlets into said tube, substantially as de scribed.

In testimony that I claim the foregoing as my own I aflix my signaturein presence of two witnesses ALVAN A. SIMONDS.

Witnesses:

B. PIOKERING, O. A. WAI/rMIRn.

